I would be surprised at a professional using a motor. It just invalidates the entire sport and the lifetime of work that they would have put into it to get to this level. One does not get there without a love for what they are doing. Some may point to doping but I think that is different. Its still very wrong in a professional context but its still a human body at peak performance doing the work. Using a motor is something else entirely. I could of course be wrong but I would be shocked, it would be an abandoning of the entire personality that drove one to reach that level.